已有不少研究观察到β-胡萝卜素与肺癌的危险性呈负相关。VE与肺癌、乳腺癌呈负相关也有报道。据报道吸烟等因素会使血中胡萝卜素类的水平降低,因此作者作了本研究。作者利用1982年7月1日至1985年9月1日一项研究黑色素瘤的资料,选出399人,其中330人完成了问题询问表并提供了血样。调查还通过一种以食品频率为主的调查表,包 Many studies have observed a negative correlation between beta-carotene and the risk of lung cancer. VE and lung cancer, breast cancer was also negatively correlated. It is reported that smoking and other factors will make blood levels of carotenoids lower, so the author made this study. Using data from a study of melanoma from July 1, 1982 to September 1, 1985, the authors selected 399 individuals, 330 of whom completed the questionnaire and provided blood samples. The survey also adopted a food-based questionnaire, package